We quantified annual growth rate and loss of Bryoria capillaris and Usnea dasopoga transplants on Picea abies on parts of lower branches in the inner versus outer canopy in small, medium and tall trees in hemiboreal forests. Light at branches in the inner canopy was 2.7 x (for Bryoria capillaris) and 2.0 x (for Usnea dasopoga) higher than the lichens’ respective light compensation points, 10.7 ± 1.2 and 14.5 ± 2.2 μmol m⁻² s⁻¹, respectively. Many Bryoria thalli were lost/fragmented on sheltered inner branches of small and intermediate trees, not on outer canopy branches exposed to wind, rain and snow. Hardly any loss occurred for Usnea. After excluding lost/fragmented specimens, Bryoria that remained intact grew faster (43.1 ± 4.4%) than Usnea (29.8 ± 1.4%). Outer canopy branches supported higher growth rates in Usnea (35.6 ± 1.5%) than inner branches (23.5 ± 2.1%), consistent with its association with rainy areas, whereas Bryoria that avoided loss grew fast in both branch locations. Bryoria, lower in secondary carbon-based compounds than Usnea, and thus the more palatable species, was likely grazed on inner branches and smaller trees accessible to rodents.

我们量化了半球形森林中小，中型和高大树木内外冠层下部分支部分上的云杉皮毛上的毛毛苔藓和松萝游动的年增长速率和损失。内冠层的分支处的光分别比地衣的相应光补偿点高2.7 x（对于毛苔藓）和2.0 x（对松萝），分别为10.7±1.2和14.5± 2.2μmolm ^-2 s ^-1。许多百日草（Bryoria thalli）在受保护的中小树木的内部树枝上丢失/碎片化，而不是在暴露于风，雨和雪的外部树冠树枝上丢失/碎片化。几乎没有发生任何损失松萝。不含丢失/分段标本后，Bryoria该保持完整增长快（43.1±4.4％）比松萝（29.8±1.4％）。外冠层支持的松萝（35.6±1.5％）高于内分支（23.5±2.1％）的增长率，这与其与多雨地区的关系一致，而避免了损失的苔藓虫在两个分支位置均迅速增长。Bryoria，降低比仲碳基化合物松萝，因此更可口物种，很可能擦过上内分支和较小的树木啮齿动物访问。